From 8a173b1476d126674104c7c5c6cef0bcd824b001 Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Tue, 29 May 2012 11:18:44 +0200 Subject: spinlock: Indicate that a lockup is only suspected On an over-committed KVM system we got a: "BUG: spinlock lockup on CPU#2, swapper/2/0" message on the heavily contended virtio blk spinlock. While we might want to reconsider the locking of virtio-blk (lock is held while switching to the host) this patch tries to make the message clearer: the lockup is only suspected. Signed-off-by: Christian Borntraeger Cc: Rusty Russell Cc: Michael S. Tsirkin Cc: Linus Torvalds Cc: Andrew Morton Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1338283124-7063-1-git-send-email-borntraeger@de.ibm.com Signed-off-by: Ingo Molnar --- lib/spinlock_debug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'lib/spinlock_debug.c') diff --git a/lib/spinlock_debug.c b/lib/spinlock_debug.c index d0ec4f3d159..e91fbc23fff 100644 --- a/lib/spinlock_debug.c +++ b/lib/spinlock_debug.c @@ -118,7 +118,7 @@ static void __spin_lock_debug(raw_spinlock_t *lock) /* lockup suspected: */ if (print_once) { print_once = 0; - spin_dump(lock, "lockup"); + spin_dump(lock, "lockup suspected"); #ifdef CONFIG_SMP trigger_all_cpu_backtrace(); #endif -- cgit v1.2.3-70-g09d2 From 4b0681487bf72fdb86b42c93b7d8a607e5a426b1 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Mon, 30 Jul 2012 14:41:11 -0700 Subject: spinlock_debug: print offset in addition to symbol name If there are two spinlocks embedded in a structure that kallsyms knows about and one of the spinlocks locks up we will print the name of the containing structure instead of the address of the lock. This is quite bad, so let's use %pS instead of %ps so we get an offset in addition to the symbol so we can determine which particular lock is having problems. Signed-off-by: Stephen Boyd Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/spinlock_debug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'lib/spinlock_debug.c') diff --git a/lib/spinlock_debug.c b/lib/spinlock_debug.c index e91fbc23fff..eb10578ae05 100644 --- a/lib/spinlock_debug.c +++ b/lib/spinlock_debug.c @@ -58,7 +58,7 @@ static void spin_dump(raw_spinlock_t *lock, const char *msg) printk(KERN_EMERG "BUG: spinlock %s on CPU#%d, %s/%d\n", msg, raw_smp_processor_id(), current->comm, task_pid_nr(current)); - printk(KERN_EMERG " lock: %ps, .magic: %08x, .owner: %s/%d, " + printk(KERN_EMERG " lock: %pS, .magic: %08x, .owner: %s/%d, " ".owner_cpu: %d\n", lock, lock->magic, owner ? owner->comm : "", -- cgit v1.2.3-70-g09d2